A Fox News host is the mystery third client of US President Donald Trump's lawyer, a court has heard.

A judge ruled that Michael Cohen, the president's personal attorney, must reveal the link to Sean Hannity.

Monday's hearing in New York City follows an FBI raid this month on the presidential lawyer's home and office, which Mr Hannity has called an anti-Trump "witch hunt".

A vocal Trump advocate, Mr Hannity denied he was a client of Mr Cohen.

The conservative host, who is known for passionately defending Mr Trump on his Fox News show against what he describes as biased attacks by the media, had never previously divulged any legal ties to the president's attorney.

Fox News said in a statement: "While Fox News was unaware of Sean Hannity's informal relationship with Michael Cohen and was surprised by the announcement in court yesterday, we have reviewed the matter and spoken to Sean and he continues to have our full support."

What is the court case about?

FBI agents who raided Mr Cohen's home and evidence were looking for evidence on various matters, including a $130,000 (£90,000) payment made to adult-film actress Stormy Daniels, who alleges she had an affair with Mr Trump and was paid "hush money".

Monday saw the judge deny Mr Cohen's attempts to prevent prosecutors from reviewing the materials seized in the FBI raids.

Mr Trump's attorney says the computers, phones and documents should be protected under attorney-client privilege.

But Judge Kimba Wood ruled his application for a preliminary injunction was premature.

The judge allowed prosecutors to proceed with the cataloguing of evidence seized in the raids while a system is set up to ensure that records protected by attorney-client privilege are not disclosed to investigators.

But she will also consider appointing a "special master" to play a supervisory role in the process.